<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .star1{
      position: absolute;

      width: 0;
      height: 0;
      border-left: 100px red solid ;
      border-top: 100px transparent solid;
      transform: rotate(75deg);
    }
  </style>
</head>

<body>
  <div class="star1"></div>
  <div class="star2"></div>
  <div class="star3"></div>
  <!-- <div id="app">
  {{ msg }}
  {{ count }}
</div> -->

  <!-- <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>

<script>

  const app = new Vue({
    el: '#app',
    data: {
      // 响应式数据 → 数据变化了，视图自动更新
      msg: '你好，黑马',
      count: 100
    }
  })

  // data中的数据，是会被添加到实例上
  // 1. 访问数据  实例.属性名
  // 2. 修改数据  实例.属性名 = 新值

</script> -->


</body>

</html>